CN107912024A - Method by being granulated production solid urea - Google Patents

Method by being granulated production solid urea Download PDF

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Publication number
CN107912024A
CN107912024A CN201680038056.3A CN201680038056A CN107912024A CN 107912024 A CN107912024 A CN 107912024A CN 201680038056 A CN201680038056 A CN 201680038056A CN 107912024 A CN107912024 A CN 107912024A
Authority
CN
China
Prior art keywords
urea
pelletizing
formaldehyde
melt
equipment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201680038056.3A
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Chinese (zh)
Inventor
吉安弗兰科·贝德蒂
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ka Sale Co Ltd
Casale SA
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Ka Sale Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ka Sale Co Ltd filed Critical Ka Sale Co Ltd
Publication of CN107912024A publication Critical patent/CN107912024A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/16—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by suspending the powder material in a gas, e.g. in fluidised beds or as a falling curtain
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05C—NITROGENOUS FERTILISERS
    • C05C9/00—Fertilisers containing urea or urea compounds
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05C—NITROGENOUS FERTILISERS
    • C05C9/00—Fertilisers containing urea or urea compounds
    • C05C9/005—Post-treatment
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C273/00—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups
    • C07C273/02—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups of urea, its salts, complexes or addition compounds
    • C07C273/14—Separation; Purification; Stabilisation; Use of additives
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C273/00—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups
    • C07C273/02—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups of urea, its salts, complexes or addition compounds
    • C07C273/14—Separation; Purification; Stabilisation; Use of additives
    • C07C273/16—Separation; Purification

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Fertilizers (AREA)

Abstract

A kind of method by being granulated production solid urea, wherein described be granulated by being sent into purity more than 98wt% and not containing the liquid urine of formaldehyde and usually carry out.

Description

Method by being granulated production solid urea
Technical field
The present invention relates to solid urea production field.
The prior art
Solid urea is mainly produced by pelletizing or granulation.
Pelletizing is included cools down the liquid area drop dropped into tower by counter-flow air.The solid being consequently formed is claimed For spherolite.It is granulated to include and is ejected into liquid area inside appropriate comminutor on the particle of (such as in fluid bed)；Liquid shape Into the layer of a solidification, so as to increase the size of particle.It is that both technologies will be known to those skilled in the art and It is described in the literature, for example, Mason, " uric acid ", Liv Ullmann industrial chemistry encyclopaedia, Wiley-VCH Verlag are published Society, 2010.
Granulation has the advantages that a series of generally acknowledged, and thinks that it is better than pelletizing technology.It is well known that spherolite has necessarily Brittleness, this is substantially due to that drop rapidly cools to form loose structure.The solid product obtained by being granulated has very big Mechanical strength, in particular for the mechanical strength for crushing and tapping, therefore, which is more applicable in a manner of bulk Stored and transported.Another advantage of granulation is can to produce the particle of large-size, such as a diameter of 3mm or bigger Particle, and the diameter of spherolite is no more than 2mm, this is because the size of bigger needs excessive and prohibitively expensive pelletizing tower and will Produce the problem of drop is unstable.
However, although having the advantages that these, since compared with prilling section, the cost of pelletizing part is relatively low, so currently Most of solid urea is still produced using pelletizing technology.
According to the prior art and technical literature, balling process needs high concentration urea fusant, preferably 99.7wt% or more The urea melt of high concentration.As known, urea equipment production is (usual containing a certain amount of water (in the downstream of recovery section) About 30%) solution；Therefore, reach foregoing dense using the appropriate concentration and evaporation part for being designed to go water removal completely Degree.
On the contrary, it is known according to the prior art, it is 96wt% or up to 98wt% by adding concentration, i.e., still contains about 2- 4% water, urea liquid carry out granulation process.The granulation process is believed to allow the water of bigger to contain compared with pelletizing Amount, therefore, the prior art thinks and need not go to remove water completely.In addition, in granulation process, about 4% water content is considered It is favourable to avoid the undesirable byproduct i.e. formation of biuret.
The supplier of urea technology has been developed that specific granulating technique, which has in terms of some details Institute is different, but its common ground, which is them, all uses the urea of above-mentioned concentration scale.
These known procedure-granulations and pelletizing-another feature be, addition formaldehyde be used as additive be used to improve it is solid The mechanical property of body urea.In general, the additive amount of formaldehyde is between the 0.2% of urea and 0.4%.Lacked despite the presence of two Point, but the addition of formaldehyde is considered as, for promote to be granulated and for obtaining the mechanical strength needed for market it is indispensable Few.
First shortcoming is cost：Producing the equipment of thousands of ton urea daily needs substantial amounts of formaldehyde, necessary daily Some tonnes of formaldehyde is provided.Formaldehyde not always produces at the scene, and many urea equipments are located at outlying district.Therefore, There is provided the additive causes higher purchase cost, cost of transportation and storage cost.
It is being increasingly taken seriously another disadvantage is that environment influence.Solid urea (spherolite or particle) is mainly as fertilizer For agricultural, it means that the formaldehyde included in urea is released to underground.Since formaldehyde is considered as possible carcinogen, This has a negative impact environment and causes human health problems.But despite of that formaldehyde be still considered as it is indispensable 's.The existing process (being referred to as " technology urea ") in formaldehydeless production urea, however, technology urea is of high cost and output compared with It is small.
For the foregoing reasons, it is possible to understand that, it is necessary to improve the quality of solid urea, especially its purity and mechanical strength.
The content of the invention
The present invention based on thinking be that pure urea melt is used in granulation process, does not add formaldehyde.
Advantageously, the purity of the urea melt is more than 98wt%, more advantageously, is at least 99.5wt%, and very To more advantageously, it is at least 99.7wt%.
It has been found that in conventional granulation process, water included in urea charging, although its amount very little (about 3- 4%), also product quality can be declined.Granulation is substantially a successively growth course, and applicant have observed that, moisture steams Hair (occurring in granulation process) is easy to produce hole in particle cores.Therefore, although particle surface, i.e. outer layer, it appears that have Good visual performance and mechanical performance, but the internal layer of particle is weakened by hole.
Never recognize this technical problem in the prior art, on the contrary, its encourage using about 96wt% urea into Material is granulated.It has been found that carry out what granulation process was obtained using substantially anhydrous urea (concentration is more than 98%) Mechanical quality can no longer need to add formaldehyde.Applicant further found that although not adding formaldehyde, the biuret of formation still can in market In the standard level of receiving (such as less than 0.9%).
It should be pointed out that compared with conventional granulating technique, the present invention needs water removal of making a return journey in a more effective manner, this can It can produce extra cost (although extremely limited).However, the cost can by the superior quality of final products and especially by Offset in huge advantage caused by formaldehyde need not be added.
Improved grain structure causes the superior of product.The moisture of hole can be produced in internal granular layer due to eliminating Evaporation process, the present invention can obtain more uniform grain structure.
Double benefit is brought without using formaldehyde, because this eliminates institute in terms of the high items of cost and ecology and environment influence The problem of concern.
The present invention provides a kind of technology for being used to obtain the granular solids urea without formaldehyde.Therefore, the present invention makes urine Plain manufacturer is capable of providing a kind of mechanical strength having equivalent to or better than obtainable particle now, but has and be free of formaldehyde And the product for the advantages of environmentally friendly machine can be considered as.Thus, can be relatively low compared with the process of known production technology urea Cost obtain formaldehydeless urea.
One aspect of the present invention further relates to a kind of method using pelletizing part transformation existing equipment.These equipment have had There is evaporation section, which is designed to obtain higher concentration (such as 99.7%) and correctly feed to pelletizing tower, by This, these equipment can be provided by adding prilling section and being sent at least a portion to the new prilling section by existing evaporation section High concentration urea fusant transformed.By doing so it is possible, the equipment provides a kind of improved products (particle, and aspheric Grain), addition formaldehyde can be saved, and make full use of existing evaporation section.
In this way, the present invention also solves transformation and improves the demand of the urea equipment based on pelletizing tower, these bases It is typically out-of-date in the urea equipment of pelletizing tower, but still largely exists in worldwide.
According to one embodiment of present invention, a part for the urea melt can be used in pelletizing tower to produce for being somebody's turn to do The nuclear species of granulation process.When the present invention be applied to transformation include the urea equipment of pelletizing tower when, the process be it is especially advantageous, because The purpose is implemented for for existing pelletizing tower.In certain embodiments, the production of spherolite can be interrupted, it means that this changes The equipment made only exports particle.
The present invention can be implemented by using all granulating techniques known per se.Preferably, fluid bed can be used It is granulated.It is further preferred that the fluidized bed prilling inside longitudinal comminutor can be used, wherein fluidized particles are rotated to form one It is vortexed or two strands of inverse vortexs revolves, as illustrated in EP 1412069.A part of urea melt charging is applicable to production and makes The nuclear species of grain process.
Brief description of the drawings
Fig. 1 is the schematic diagram of the first embodiment of the present invention.
Fig. 2 is the schematic diagram of second embodiment.
Fig. 3 is the schematic diagram of 3rd embodiment.
Embodiment
Fig. 1 shows the schematic diagram of urea equipment, which includes composite part US and recycle sections UR.Follow again Loop section UR provides the aqueous solution of urea SOL of urea content about 70wt%.
By evaporation section EV, in evaporation section EV, water is removed the solution, is exceeded so as to obtain urea content 98wt%, such as 99.7wt%, urea melt UM.To the urea melt for not adding formaldehyde described in prilling section GS feedings UM, so as to obtain urea granules U.
Fig. 2 shows an example of reforming equipment, and wherein urea melt UM is fed to production carbamide granule P originally Pelletizing part PS in.At least a portion UM' of the urea melt UM is fed in prilling section GS, prilling section GS It is arranged in parallel with pelletizing part PS, does not add formaldehyde equally in this case.
In certain embodiments, UM streams are overall is directly directed to new prilling section GS, i.e. the production of spherolite P is interrupted.
Fig. 3 shows one embodiment, which is a part of UM " of a variation, wherein urea melt of Fig. 2 For in existing pelletizing part PS, the solid nuclear species S of prilling section GS to be used for production.

Claims (6)

  1. A kind of 1. method by being granulated production solid urea, it is characterised in that the granulation is more than by being sent into concentration The urea melt of 98wt% carries out, also, in the urea melt does not add formaldehyde.
  2. 2. according to the method described in claim 1, it is characterized in that, the concentration of the urea melt is at least 99.5wt%, Preferably, it is at least 99.7wt%.
  3. 3. a kind of equipment for producing granular solids urea, it uses the method described in claim 1 or 2 to be operated.
  4. 4. a kind of granular solids urea, it is obtained without formaldehyde and by the method described in claim 1 or 2.
  5. 5. a kind of method for transforming the equipment for being used to produce solid urea, wherein, the equipment includes pelletizing part, the pelletizing Part produces solid urea by carrying out pelletizing to high concentration urea fusant, the described method includes：Prilling section is installed simultaneously At least one of urea for not adding formaldehyde for being originally used for the pelletizing part to the new prilling section feeding melts Melt thing.
  6. 6. according to the method described in claim 5, wherein, a part for the urea melt is used for the pelletizing part, with Just nuclear species of the production for the new prilling section.
CN201680038056.3A 2015-07-03 2016-06-08 Method by being granulated production solid urea Pending CN107912024A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP15175347.2A EP3112332A1 (en) 2015-07-03 2015-07-03 Method for producing solid urea by granulation
EP15175347.2 2015-07-03
PCT/EP2016/063027 WO2017005446A1 (en) 2015-07-03 2016-06-08 Method for producing solid urea by granulation

Publications (1)

Publication Number Publication Date
CN107912024A true CN107912024A (en) 2018-04-13

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CN201680038056.3A Pending CN107912024A (en) 2015-07-03 2016-06-08 Method by being granulated production solid urea

Country Status (11)

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US (3) US20180185803A1 (en)
EP (2) EP3112332A1 (en)
CN (1) CN107912024A (en)
AU (3) AU2016289338A1 (en)
BR (1) BR112018000110A2 (en)
CA (1) CA2988830A1 (en)
CL (1) CL2017003383A1 (en)
MX (1) MX2017016873A (en)
RU (1) RU2742933C2 (en)
UA (1) UA124298C2 (en)
WO (1) WO2017005446A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021108187A1 (en) 2021-03-31 2022-10-06 Skw Stickstoffwerke Piesteritz Gmbh Granulated pH neutral urea ammonium sulphate fertilizer with urease inhibitor

Citations (5)

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WO2002074427A2 (en) * 2001-03-21 2002-09-26 Urea Casale S.A. Fluid bed granulation process
CN1878608A (en) * 2003-11-10 2006-12-13 帝斯曼知识产权资产管理有限公司 Process for the preparation of urea granules
EP2676726A1 (en) * 2012-06-18 2013-12-25 Urea Casale SA Method and apparatus for the granulation of a liquid, in particular for the granulation of urea
CN103827081A (en) * 2011-08-17 2014-05-28 斯塔米卡邦有限公司 Urea production process characterized by short urea melt transportation time between last concentrator and prilling tower
CN104402769A (en) * 2014-12-04 2015-03-11 重庆建峰化工股份有限公司 Production process for Adblue

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WO2002074427A2 (en) * 2001-03-21 2002-09-26 Urea Casale S.A. Fluid bed granulation process
CN1878608A (en) * 2003-11-10 2006-12-13 帝斯曼知识产权资产管理有限公司 Process for the preparation of urea granules
CN103827081A (en) * 2011-08-17 2014-05-28 斯塔米卡邦有限公司 Urea production process characterized by short urea melt transportation time between last concentrator and prilling tower
EP2676726A1 (en) * 2012-06-18 2013-12-25 Urea Casale SA Method and apparatus for the granulation of a liquid, in particular for the granulation of urea
CN104402769A (en) * 2014-12-04 2015-03-11 重庆建峰化工股份有限公司 Production process for Adblue

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Publication number Publication date
UA124298C2 (en) 2021-08-25
RU2018104089A (en) 2019-08-06
EP3112332A1 (en) 2017-01-04
EP3317234A1 (en) 2018-05-09
CL2017003383A1 (en) 2018-06-01
BR112018000110A2 (en) 2018-09-04
RU2742933C2 (en) 2021-02-11
AU2020267178A1 (en) 2020-12-03
WO2017005446A1 (en) 2017-01-12
AU2023200551A1 (en) 2023-03-02
AU2016289338A1 (en) 2018-01-18
RU2018104089A3 (en) 2019-09-10
US20180185803A1 (en) 2018-07-05
CA2988830A1 (en) 2017-01-12
MX2017016873A (en) 2018-04-30
US20200215507A1 (en) 2020-07-09
US20220072492A1 (en) 2022-03-10

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